William53

i have a 2005 ford f150 fx4 i changed all seals and bearings in rear along with ring and pinion , still howling under load and just before stopping you can hear what sounds like gears meshing together . dont know what to do next any suggestions ? and yes all new fluid in rear end

techrep

iTrader: (1)

Did you add friction modifier ?

William53

no did not add anything to fluid

techrep

iTrader: (1)

is your rear end a 3:73 LS ?

William53

9.75 12 bolt b6 axle it says on door

William53

3.73 gears

William53

v 953 - r are the numbers i could get off rear end tag

techrep

iTrader: (1)

Axle code B6 is a 3:73 limited slip LS and it requires Friction modifier to be added to the gear oil in the rear end. I suggest you put at least 4oz bottle of Limited slip friction modifier into that read end ASAP. you can jack the same side of the truck up as your fill hole and possibly add the 4 oz.

William53

ok i will get it and get it in thank you

Martian

Don't get any on you. It smells awful.